What was found
WHILE AT CRUISE, ALTITUDE OF 27,000 FEET, THE CREW BECAME AWARE OF A STRONG ELECTRICAL ODOR; SHORTLY THEREAFTER, THE FMS UNIT WAS OBSERVED TO GO "BLANK". THE CREW DIVERTED. THE FMS UNIT APPEARED TO FEEL UNUSUALLY HOT. REMOVED FMS & SMELLED STRONG ODOR. REMOVED FMS & INSPECTED WIRING DOWN IN PEDESTAL FOR BURNS ETC. NO BURNS OR CHAFING NOTED. R & R FMS. TRANSFERED NDB DISK OVER. POWER DUP UNIT AND OPS CHECKED FMS GOOD. RESTORED PEDESTAL AVIONICS AND OPS CHECKED GOOD. ALL WORK IAW 560 MM 34-61-00.